U.P. Law Center, 1975
Buku Teks
Schlatter, Richard, author
George Allen & Uwin , 1951
Buku Teks
Kintner, Earl W., author
Macmillan, 1975
Buku Teks
Kur, Annette, author
Edward Elgar, 2013
Buku Teks
Haar, Charles M., author
Little, Brown, 1977
Buku Teks